MYTILUS. 317 



anatinus. 36. Shell transversely oval, very brittle, 

 semi-transparent, rather compressed, and the 

 margin membranaceous ; umbones decorti- 

 cated. 



Mytilus anatinus. Linn ecus Syst. Nat. p. 1158. Midler 

 Verm. ii. p. 207- Schroeter Fluss. p. 16*0. t. 1. f. 2 and 

 3. Pennant Zool iv. p i\3. t. 68. f 79. Da Costa 

 Brit. Conch, p. 215. t. 15. f. 2. Chemnitz, viii. p. 189. 

 t. 86. f. 763. Schioeter Einl.'m. p. 442. Gmeiin, p. 

 3355. Montagu Test. p. 171. Donovan Brit. Shells, 

 iv. p. 113. Maton and Racket, in Lin. Trans, viii. p. 

 110. t. 3 A. f. 1. Dorset Cat. p. 40. t. 13. f. 6. Brooks's 

 Introd. p. 86. t. 4. f. 49- 

 Anodonta anatina. Lamarck Syst. des Anim. p. 114. 

 Anodonta. Em. Method, t. 202. f. 1. 

 Lister Anim. Ang. t. 2. f. 29, App. t. 1 . f. 2, and Conch. 

 t. 153. f. 8. Petiver Gaz. t. 93. f. 8. Gualter, t.7. f. E. 

 Argenville, t. 31. middle fig. 10. 

 Inhabits rivers and other fresh waters in England, and most 



other parts of Europe. 

 Shell about two inches long, and three and a half broad, and is 

 very like M. Cygneus, but is usually of a brighter green co- 

 lour, and has the margin at the hinge more prominent, and 

 rising into a sort of angulated wing on the anterior side. 



fucatus. 37. Shell transversely oblong, convex, 

 smooth, with the umbones prominent and de- 

 corticated, and the summits inflected. 



Mytilus fucatus. Solander's MSS. Portland Cat. p. 29. 



lot 672. 

 Mytilus Avonensis. Montagu Test. p. 1 72. 

 Mytilus anatinus, Var. /?. Gmeiin, p. 3355. Maton and 



Racket, in Lin. Trans, viii. p. 1 10. t. 3 A. f. 4. 

 Mytilus, No. 20. Schroeter Einl. iii. p. 458. 

 Lister Conch, t. 154. f. 9. 



Inhabits the rivers of Virginia. Lister. Maryland. Solander. 

 River Avon about Lackham, in Wiltshire. Montagu. 



Shell about an inch and three-quarters long, and three inches 

 and a half broad ; of a greenish brown colour, with concen- 

 tric wrinkles; it differs from M. anatinus in being rather 

 broader in proportion to its length, and in having the upper 

 margin on the anterior side less produced, and less angular, 

 and the posterior side more rounded. Mr. Montagu says 



